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Re: Boot DOS and read CD?

Posted on 2008-03-18, 10:17

are you sure that that one call doesn't result in more tests being done ? I'm pretty sure that call is the entire issue, as I wrote a little TSR that modifies the return value of 21/4408 to always be 1 (fixed) as long as there was no error returned (invalid drive or such), and it cures the install …

Re: Boot DOS and read CD?

Posted on 2008-03-18, 09:55

wd wrote: There goes your compatibility idea. You could always make it a conf file setting, fixedcd=false, does that put it back in play? 😁 Just kidding, the issue is hardly rampant among CD-based installation programs, and there is a simple workaround in the case of T7G.

Re: Boot DOS and read CD?

Posted on 2008-03-18, 09:20

The only reason would be compatibility, of course. But I do agree that DOSBox is doing the most reasonable thing. However, considering that the problematic version of the T7G installer thinks CD drives should be considered as fixed, and that the WinXP NTVDM is considering CD drives as fixed, I see …

Re: Boot DOS and read CD?

Posted on 2008-03-18, 02:58

Thanks for confirming that. And it's good that there's a relatively simple workaround to prescribe for others experiencing the problem. I tried 21/4408 under the WinXP NTVDM, and my 3.5" floppy disk is reported as removable, but all of my HDs and optical drives are reported as fixed. It's …

Re: Boot DOS and read CD?

Posted on 2008-03-17, 23:21

What I found is based on a downloaded update package, and there's no certainty that it's identical to what's on the CDs with the problem, although there is some evidence for it. The INSTALL.EXE that I'm looking at is 43,704 bytes, date/time stamp of 7/23/93 6:55pm, CRC-32=4033D8EE If yours is not …

Re: Boot DOS and read CD?

Posted on 2008-03-17, 18:40

The groovie.ini and audio.dat are looked for in the current drive and directory only once, so that is its "already installed" check. The scanning with 4408 thing is the issue, 4409 is just something else it does. I'm not positive that indicating a CD is removable is correct, but it certainly sounds …

Re: Boot DOS and read CD?

Posted on 2008-03-17, 17:51

wd, it is calling both AX=4408 (removable check) and AX=4409 (remote check) for BL=03 through BL=1A (C-Z). Any drive that is indicated as fixed (not removable) is checked for the HDISK.GJD file. After this scanning of all the drives is complete, and IF a source is "located", a list of installation …

Re: Boot DOS and read CD?

Posted on 2008-03-17, 11:03

Going further with the debugger, I learned that the installer is testing all of the drives from C thru Z and deciding if they're an installation "target" or an installation "source". So, sorry mg55, you weren't quite right. :wink: The reason the D: drive is rejected as an installation source is …

Re: Boot DOS and read CD?

Posted on 2008-03-17, 03:11

There have been a number of threads about this problem installing The 7th Guest in DOSBox, such as this one: http://www.vogons.org/viewtopic.php?t=16855 It seems the earliest releases of the CD had no issues with installing in DOSBox, but some later releases do. The update called T7GFIX3.ZIP …

Re: Interresting mount c c:\ discussion

Posted on 2008-03-03, 17:26

You would think that people on an abandonware site, used to using software from questionable sources, would be more paranoid about viruses and trojans that corrupt or delete files than people who use legit copies. Mounting C:\ ups the stakes in really obvious ways; I just don't see why some people …

Re: Swaping Disks during Installs...

Posted on 2008-02-15, 09:07

If floppy disk images are in fact what the OP is working with, then there is the somewhat tedious method of mounting a folder as the A or B drive in DOSBox and using your OS to move the contents of the various disks into the folder when requested by the install program. Same trick can be done in the …

Re: Swaping Disks during Installs...

Posted on 2008-02-14, 21:38

I must admit that I was uncertain at first at how swapping disks worked in DOSBox. I was just more determined to figure it out on my own than ask. That ctrl-f4 is the switch was obvious from the README, but specifiying multiple filespecs in the MOUNT/IMGMOUNT commands was not. There is nothing I can …

Re: The 7th Guest

Posted on 2008-01-16, 21:25

You would only need to change DataDir to reflect the drive letter of the CD you've mounted in DOSBox; and since you're using the D drive, you could probably leave it unchanged from my example. You will need to change ProgDir to point to where you've installed the files within DOSBox. Note that the …

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